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Goodwill, Trade Names, and Other Intangible Assets - Estimated Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 7,167  
2019 7,131  
2020 7,027  
2021 6,819  
2022 6,743  
Thereafter 26,089  
Net Carrying Amount $ 60,976 $ 36,835